The facts on mass shootings in the United States -- PolitiFact

The massacre of 26 worshipers at a rural Texas church is the latest in a grisly series of mass shootings across America in recent years. With each tragedy, we hear arguments about gun violence, mental health, how much firearms should be regulated and what's driving the prevalence of mass shootings. PolitiFact has worked for years to research these topics to help explain talking points used by all sides of the debate. Here are some answers to some questions you may have. ....
http://www.politifact.com/truth-o-meter/article/2017/nov/08/facts-mass-shootings-united-states/